bradleyj00
Templates make undoing your changes very easy, that's part of their beauty.
To undo or reverse what you did, simply delete the the custom template, expand & restart:
rm /etc/e-smith/templates-custom/etc/crontab/your_file_name
expand-template /etc/crontab
service crond restart
I strongly suggest you take a look at the Template Tutorial Howto
http://wiki.contribs.org/Template_Tutorial